This is the most common mod. You can replace Goku’s model with Super Saiyan 4 Gogeta, or replace Hercule with Jiren. Since the 360 cannot load new custom slots easily, modders overwrite existing characters.
To begin modding on this platform, you typically need a PC to bridge the gap between your console's save data and the mod files: Horizon or Modio Dragon Ball Xenoverse Mods Xbox 360 Download - Google